| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a wireless data carrier writing/reading system for accomplishing the reduction of costs and thinning by abolishing the attachment itself of a plate and a reflector to a wireless data carrier itself. <P>SOLUTION: A power feeding radio wave 21 radiated from an antenna 3 is reflected on a reflector 6. A reflection wave 22 interferes with the radio wave 21 and a standing wave 23 is generated. Positions of the belly and the node of the standing wave are determined by a distance from the reflector 6 at all the time. Furthermore, the strength of the wave becomes maximum at the position of each belly. Namely, a position appearing first where the radio wave is most strengthened is "a position separated from the reflector 6 by λ/4" and a position where a radio wave is strengthened, appears later at the intervals of λ/2. If a wireless data carrier 1 comes to such a position where a radio wave is strengthened, high operational power can be obtained, so that writing and reading operations are most stabilized. The wireless data carrier 1 is adjusted so as to pass a position 30 of the belly of the standing wave 23 at all the time, so that stable reading and writing can be performed. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
